_tolower (3)

PROLOG

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

_tolower --- transliterate uppercase characters to lowercase

SYNOPSIS

#include <ctype.h>
int _tolower(int c);

DESCRIPTION

The _tolower() macro shall be equivalent to tolower(c) except that the application shall ensure that the argument c is an uppercase letter.

RETURN VALUE

Upon successful completion, _tolower() shall return the lowercase letter corresponding to the argument passed.

ERRORS

No errors are defined.

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

Applications should use the tolower() function instead of the obsolescent _tolower() function.

RATIONALE

None.

FUTURE DIRECTIONS

The _tolower() function may be removed in a future version.

SEE ALSO

tolower(), isupper() The Base Definitions volume of POSIX.1-2008, Chapter 7, Locale, <ctype.h>

COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see www.kernel.org/doc/man-pages/reporting_bugs.html .